2004 trailblazer dont wont to into high gears rpm peg out feels like its slipping

see if this link helps you out.... My 2004 chevy trailblazer won shift from second to third gear Google Search

auto trans.101
1: check levels by the book, not like engine. RTM
2: check fuses.
3: scan it, or get it scanned. for transmission errors.
if car wont move and RPM goes high as foot presses guess
that is trans slip.
of RPM (engine) does not rise or only tiny,
that is lost engine power, total loss. but idle. (can happen)

Sounds like your right on...

A/T or M/T
auto/stick.
all gears dead?
car will not move in any gear.
does transmission slip
slip means RPM (tachometer) rises real high as right foot hits floor
and car dont budge.
slip that is called. or flare .

a jeep lumina?
wrong forum but that is ok, seems to be common here.
what wont shift.
A/T or M/T auto or stick? tranny????
what does will not , mean?
I cant move the shift lever
i cant shift, to 2nd
IT (autobox ) will not shift ever, or slips or flares. or?
if its and A/T autotranny, tell me what it does right and wrong
here is an example.
i start engine.
i shift to drive car dont move, in any gear
i see RPM race high with right foot over 3000 RPM.
tranny failure. (slips)
or RPM stays near 1500, and engine sounds loaded,
and i find the parking brake stuck on, or the brakes are full of ice
and stuck fast.

The clutch lining worn out n the lining powder stuck on the transmission filter so transmission fluid pass through the filter clogged.. Only way is to repair the transmission or replace the whole transmission.

You have a slipping transmission, if the fluid is full then you will need to have the ****** removed and rebuilt.

not sure if it will make much difference but there are sensors on the trans that can be bad and you really have no way to tell it. or a wheel speed sensor or could even be a dirty clogged trans filter but I am leaning more towards the sensors. I can bet when they rebuilt the trans they just reused the same sensors and thats why you still have the same problem

sounds like the transmisison is slipping or not upshifting properly into high gear.

I have a 2003 that had the same problem, in addition to millions of electrical issues. After about 8 months, I replaced the battery and it's been fine since then. The old battery continually showed full charge.